target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c

   1 /*
   2  *  Atheros AR71xx built-in ethernet mac driver
   3  *
   4  *  Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
   5  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   6  *
   7  *  Based on Atheros' AG7100 driver
   8  *
   9  *  This program is free software; you can redistribute it and/or modify it
  10  *  under the terms of the GNU General Public License version 2 as published
  11  *  by the Free Software Foundation.
  12  */
  13
  14 #include "ag71xx.h"
  15
  16 #define AG71XX_DEFAULT_MSG_ENABLE       \
  17         (NETIF_MSG_DRV                  \
  18         | NETIF_MSG_PROBE               \
  19         | NETIF_MSG_LINK                \
  20         | NETIF_MSG_TIMER               \
  21         | NETIF_MSG_IFDOWN              \
  22         | NETIF_MSG_IFUP                \
  23         | NETIF_MSG_RX_ERR              \
  24         | NETIF_MSG_TX_ERR)
  25
  26 static int ag71xx_msg_level = -1;
  27
  28 module_param_named(msg_level, ag71xx_msg_level, int, 0);
  29 MODULE_PARM_DESC(msg_level, "Message level (-1=defaults,0=none,...,16=all)");
  30
  31 static void ag71xx_dump_dma_regs(struct ag71xx *ag)
  32 {
  33         DBG("%s: dma_tx_ctrl=%08x, dma_tx_desc=%08x, dma_tx_status=%08x\n",
  34                 ag->dev->name,
  35                 ag71xx_rr(ag, AG71XX_REG_TX_CTRL),
  36                 ag71xx_rr(ag, AG71XX_REG_TX_DESC),
  37                 ag71xx_rr(ag, AG71XX_REG_TX_STATUS));
  38
  39         DBG("%s: dma_rx_ctrl=%08x, dma_rx_desc=%08x, dma_rx_status=%08x\n",
  40                 ag->dev->name,
  41                 ag71xx_rr(ag, AG71XX_REG_RX_CTRL),
  42                 ag71xx_rr(ag, AG71XX_REG_RX_DESC),
  43                 ag71xx_rr(ag, AG71XX_REG_RX_STATUS));
  44 }
  45
  46 static void ag71xx_dump_regs(struct ag71xx *ag)
  47 {
  48         DBG("%s: mac_cfg1=%08x, mac_cfg2=%08x, ipg=%08x, hdx=%08x, mfl=%08x\n",
  49                 ag->dev->name,
  50                 ag71xx_rr(ag, AG71XX_REG_MAC_CFG1),
  51                 ag71xx_rr(ag, AG71XX_REG_MAC_CFG2),
  52                 ag71xx_rr(ag, AG71XX_REG_MAC_IPG),
  53                 ag71xx_rr(ag, AG71XX_REG_MAC_HDX),
  54                 ag71xx_rr(ag, AG71XX_REG_MAC_MFL));
  55         DBG("%s: mac_ifctl=%08x, mac_addr1=%08x, mac_addr2=%08x\n",
  56                 ag->dev->name,
  57                 ag71xx_rr(ag, AG71XX_REG_MAC_IFCTL),
  58                 ag71xx_rr(ag, AG71XX_REG_MAC_ADDR1),
  59                 ag71xx_rr(ag, AG71XX_REG_MAC_ADDR2));
  60         DBG("%s: fifo_cfg0=%08x, fifo_cfg1=%08x, fifo_cfg2=%08x\n",
  61                 ag->dev->name,
  62                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG0),
  63                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG1),
  64                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG2));
  65         DBG("%s: fifo_cfg3=%08x, fifo_cfg4=%08x, fifo_cfg5=%08x\n",
  66                 ag->dev->name,
  67                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG3),
  68                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG4),
  69                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG5));
  70 }
  71
  72 static inline void ag71xx_dump_intr(struct ag71xx *ag, char *label, u32 intr)
  73 {
  74         DBG("%s: %s intr=%08x %s%s%s%s%s%s\n",
  75                 ag->dev->name, label, intr,
  76                 (intr & AG71XX_INT_TX_PS) ? "TXPS " : "",
  77                 (intr & AG71XX_INT_TX_UR) ? "TXUR " : "",
  78                 (intr & AG71XX_INT_TX_BE) ? "TXBE " : "",
  79                 (intr & AG71XX_INT_RX_PR) ? "RXPR " : "",
  80                 (intr & AG71XX_INT_RX_OF) ? "RXOF " : "",
  81                 (intr & AG71XX_INT_RX_BE) ? "RXBE " : "");
  82 }
  83
  84 static void ag71xx_ring_free(struct ag71xx_ring *ring)
  85 {
  86         kfree(ring->buf);
  87
  88         if (ring->descs_cpu)
  89                 dma_free_coherent(NULL, ring->size * ring->desc_size,
  90                                   ring->descs_cpu, ring->descs_dma);
  91 }
  92
  93 static int ag71xx_ring_alloc(struct ag71xx_ring *ring)
  94 {
  95         int err;
  96         int i;
  97
  98         ring->desc_size = sizeof(struct ag71xx_desc);
  99         if (ring->desc_size % cache_line_size()) {
 100                 DBG("ag71xx: ring %p, desc size %u rounded to %u\n",
 101                         ring, ring->desc_size,
 102                         roundup(ring->desc_size, cache_line_size()));
 103                 ring->desc_size = roundup(ring->desc_size, cache_line_size());
 104         }
 105
 106         ring->descs_cpu = dma_alloc_coherent(NULL, ring->size * ring->desc_size,
 107                                              &ring->descs_dma, GFP_ATOMIC);
 108         if (!ring->descs_cpu) {
 109                 err = -ENOMEM;
 110                 goto err;
 111         }
 112
 113
 114         ring->buf = kzalloc(ring->size * sizeof(*ring->buf), GFP_KERNEL);
 115         if (!ring->buf) {
 116                 err = -ENOMEM;
 117                 goto err;
 118         }
 119
 120         for (i = 0; i < ring->size; i++) {
 121                 int idx = i * ring->desc_size;
 122                 ring->buf[i].desc = (struct ag71xx_desc *)&ring->descs_cpu[idx];
 123                 DBG("ag71xx: ring %p, desc %d at %p\n",
 124                         ring, i, ring->buf[i].desc);
 125         }
 126
 127         return 0;
 128
 129 err:
 130         return err;
 131 }
 132
 133 static void ag71xx_ring_tx_clean(struct ag71xx *ag)
 134 {
 135         struct ag71xx_ring *ring = &ag->tx_ring;
 136         struct net_device *dev = ag->dev;
 137
 138         while (ring->curr != ring->dirty) {
 139                 u32 i = ring->dirty % ring->size;
 140
 141                 if (!ag71xx_desc_empty(ring->buf[i].desc)) {
 142                         ring->buf[i].desc->ctrl = 0;
 143                         dev->stats.tx_errors++;
 144                 }
 145
 146                 if (ring->buf[i].skb)
 147                         dev_kfree_skb_any(ring->buf[i].skb);
 148
 149                 ring->buf[i].skb = NULL;
 150
 151                 ring->dirty++;
 152         }
 153
 154         /* flush descriptors */
 155         wmb();
 156
 157 }
 158
 159 static void ag71xx_ring_tx_init(struct ag71xx *ag)
 160 {
 161         struct ag71xx_ring *ring = &ag->tx_ring;
 162         int i;
 163
 164         for (i = 0; i < ring->size; i++) {
 165                 ring->buf[i].desc->next = (u32) (ring->descs_dma +
 166                         ring->desc_size * ((i + 1) % ring->size));
 167
 168                 ring->buf[i].desc->ctrl = DESC_EMPTY;
 169                 ring->buf[i].skb = NULL;
 170         }
 171
 172         /* flush descriptors */
 173         wmb();
 174
 175         ring->curr = 0;
 176         ring->dirty = 0;
 177 }
 178
 179 static void ag71xx_ring_rx_clean(struct ag71xx *ag)
 180 {
 181         struct ag71xx_ring *ring = &ag->rx_ring;
 182         int i;
 183
 184         if (!ring->buf)
 185                 return;
 186
 187         for (i = 0; i < ring->size; i++)
 188                 if (ring->buf[i].skb) {
 189                         dma_unmap_single(&ag->dev->dev, ring->buf[i].dma_addr,
 190                                          AG71XX_RX_PKT_SIZE, DMA_FROM_DEVICE);
 191                         kfree_skb(ring->buf[i].skb);
 192                 }
 193 }
 194
 195 static int ag71xx_rx_reserve(struct ag71xx *ag)
 196 {
 197         int reserve = 0;
 198
 199         if (ag71xx_get_pdata(ag)->is_ar724x) {
 200                 if (!ag71xx_has_ar8216(ag))
 201                         reserve = 2;
 202
 203                 if (ag->phy_dev)
 204                         reserve += 4 - (ag->phy_dev->pkt_align % 4);
 205
 206                 reserve %= 4;
 207         }
 208
 209         return reserve + AG71XX_RX_PKT_RESERVE;
 210 }
 211
 212
 213 static int ag71xx_ring_rx_init(struct ag71xx *ag)
 214 {
 215         struct ag71xx_ring *ring = &ag->rx_ring;
 216         unsigned int reserve = ag71xx_rx_reserve(ag);
 217         unsigned int i;
 218         int ret;
 219
 220         ret = 0;
 221         for (i = 0; i < ring->size; i++) {
 222                 ring->buf[i].desc->next = (u32) (ring->descs_dma +
 223                         ring->desc_size * ((i + 1) % ring->size));
 224
 225                 DBG("ag71xx: RX desc at %p, next is %08x\n",
 226                         ring->buf[i].desc,
 227                         ring->buf[i].desc->next);
 228         }
 229
 230         for (i = 0; i < ring->size; i++) {
 231                 struct sk_buff *skb;
 232                 dma_addr_t dma_addr;
 233
 234                 skb = dev_alloc_skb(AG71XX_RX_PKT_SIZE + reserve);
 235                 if (!skb) {
 236                         ret = -ENOMEM;
 237                         break;
 238                 }
 239
 240                 skb->dev = ag->dev;
 241                 skb_reserve(skb, reserve);
 242
 243                 dma_addr = dma_map_single(&ag->dev->dev, skb->data,
 244                                           AG71XX_RX_PKT_SIZE,
 245                                           DMA_FROM_DEVICE);
 246                 ring->buf[i].skb = skb;
 247                 ring->buf[i].dma_addr = dma_addr;
 248                 ring->buf[i].desc->data = (u32) dma_addr;
 249                 ring->buf[i].desc->ctrl = DESC_EMPTY;
 250         }
 251
 252         /* flush descriptors */
 253         wmb();
 254
 255         ring->curr = 0;
 256         ring->dirty = 0;
 257
 258         return ret;
 259 }
 260
 261 static int ag71xx_ring_rx_refill(struct ag71xx *ag)
 262 {
 263         struct ag71xx_ring *ring = &ag->rx_ring;
 264         unsigned int reserve = ag71xx_rx_reserve(ag);
 265         unsigned int count;
 266
 267         count = 0;
 268         for (; ring->curr - ring->dirty > 0; ring->dirty++) {
 269                 unsigned int i;
 270
 271                 i = ring->dirty % ring->size;
 272
 273                 if (ring->buf[i].skb == NULL) {
 274                         dma_addr_t dma_addr;
 275                         struct sk_buff *skb;
 276
 277                         skb = dev_alloc_skb(AG71XX_RX_PKT_SIZE + reserve);
 278                         if (skb == NULL)
 279                                 break;
 280
 281                         skb_reserve(skb, reserve);
 282                         skb->dev = ag->dev;
 283
 284                         dma_addr = dma_map_single(&ag->dev->dev, skb->data,
 285                                                   AG71XX_RX_PKT_SIZE,
 286                                                   DMA_FROM_DEVICE);
 287
 288                         ring->buf[i].skb = skb;
 289                         ring->buf[i].dma_addr = dma_addr;
 290                         ring->buf[i].desc->data = (u32) dma_addr;
 291                 }
 292
 293                 ring->buf[i].desc->ctrl = DESC_EMPTY;
 294                 count++;
 295         }
 296
 297         /* flush descriptors */
 298         wmb();
 299
 300         DBG("%s: %u rx descriptors refilled\n", ag->dev->name, count);
 301
 302         return count;
 303 }
 304
 305 static int ag71xx_rings_init(struct ag71xx *ag)
 306 {
 307         int ret;
 308
 309         ret = ag71xx_ring_alloc(&ag->tx_ring);
 310         if (ret)
 311                 return ret;
 312
 313         ag71xx_ring_tx_init(ag);
 314
 315         ret = ag71xx_ring_alloc(&ag->rx_ring);
 316         if (ret)
 317                 return ret;
 318
 319         ret = ag71xx_ring_rx_init(ag);
 320         return ret;
 321 }
 322
 323 static void ag71xx_rings_cleanup(struct ag71xx *ag)
 324 {
 325         ag71xx_ring_rx_clean(ag);
 326         ag71xx_ring_free(&ag->rx_ring);
 327
 328         ag71xx_ring_tx_clean(ag);
 329         ag71xx_ring_free(&ag->tx_ring);
 330 }
 331
 332 static unsigned char *ag71xx_speed_str(struct ag71xx *ag)
 333 {
 334         switch (ag->speed) {
 335         case SPEED_1000:
 336                 return "1000";
 337         case SPEED_100:
 338                 return "100";
 339         case SPEED_10:
 340                 return "10";
 341         }
 342
 343         return "?";
 344 }
 345
 346 static void ag71xx_hw_set_macaddr(struct ag71xx *ag, unsigned char *mac)
 347 {
 348         u32 t;
 349
 350         t = (((u32) mac[5]) << 24) | (((u32) mac[4]) << 16)
 351           | (((u32) mac[3]) << 8) | ((u32) mac[2]);
 352
 353         ag71xx_wr(ag, AG71XX_REG_MAC_ADDR1, t);
 354
 355         t = (((u32) mac[1]) << 24) | (((u32) mac[0]) << 16);
 356         ag71xx_wr(ag, AG71XX_REG_MAC_ADDR2, t);
 357 }
 358
 359 static void ag71xx_dma_reset(struct ag71xx *ag)
 360 {
 361         u32 val;
 362         int i;
 363
 364         ag71xx_dump_dma_regs(ag);
 365
 366         /* stop RX and TX */
 367         ag71xx_wr(ag, AG71XX_REG_RX_CTRL, 0);
 368         ag71xx_wr(ag, AG71XX_REG_TX_CTRL, 0);
 369
 370         /*
 371          * give the hardware some time to really stop all rx/tx activity
 372          * clearing the descriptors too early causes random memory corruption
 373          */
 374         mdelay(1);
 375
 376         /* clear descriptor addresses */
 377         ag71xx_wr(ag, AG71XX_REG_TX_DESC, 0);
 378         ag71xx_wr(ag, AG71XX_REG_RX_DESC, 0);
 379
 380         /* clear pending RX/TX interrupts */
 381         for (i = 0; i < 256; i++) {
 382                 ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_PR);
 383                 ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_PS);
 384         }
 385
 386         /* clear pending errors */
 387         ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_BE | RX_STATUS_OF);
 388         ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_BE | TX_STATUS_UR);
 389
 390         val = ag71xx_rr(ag, AG71XX_REG_RX_STATUS);
 391         if (val)
 392                 printk(KERN_ALERT "%s: unable to clear DMA Rx status: %08x\n",
 393                         ag->dev->name, val);
 394
 395         val = ag71xx_rr(ag, AG71XX_REG_TX_STATUS);
 396
 397         /* mask out reserved bits */
 398         val &= ~0xff000000;
 399
 400         if (val)
 401                 printk(KERN_ALERT "%s: unable to clear DMA Tx status: %08x\n",
 402                         ag->dev->name, val);
 403
 404         ag71xx_dump_dma_regs(ag);
 405 }
 406
 407 #define MAC_CFG1_INIT   (MAC_CFG1_RXE | MAC_CFG1_TXE | \
 408                          MAC_CFG1_SRX | MAC_CFG1_STX)
 409
 410 #define FIFO_CFG0_INIT  (FIFO_CFG0_ALL << FIFO_CFG0_ENABLE_SHIFT)
 411
 412 #define FIFO_CFG4_INIT  (FIFO_CFG4_DE | FIFO_CFG4_DV | FIFO_CFG4_FC | \
 413                          FIFO_CFG4_CE | FIFO_CFG4_CR | FIFO_CFG4_LM | \
 414                          FIFO_CFG4_LO | FIFO_CFG4_OK | FIFO_CFG4_MC | \
 415                          FIFO_CFG4_BC | FIFO_CFG4_DR | FIFO_CFG4_LE | \
 416                          FIFO_CFG4_CF | FIFO_CFG4_PF | FIFO_CFG4_UO | \
 417                          FIFO_CFG4_VT)
 418
 419 #define FIFO_CFG5_INIT  (FIFO_CFG5_DE | FIFO_CFG5_DV | FIFO_CFG5_FC | \
 420                          FIFO_CFG5_CE | FIFO_CFG5_LO | FIFO_CFG5_OK | \
 421                          FIFO_CFG5_MC | FIFO_CFG5_BC | FIFO_CFG5_DR | \
 422                          FIFO_CFG5_CF | FIFO_CFG5_PF | FIFO_CFG5_VT | \
 423                          FIFO_CFG5_LE | FIFO_CFG5_FT | FIFO_CFG5_16 | \
 424                          FIFO_CFG5_17 | FIFO_CFG5_SF)
 425
 426 static void ag71xx_hw_init(struct ag71xx *ag)
 427 {
 428         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
 429
 430         ag71xx_sb(ag, AG71XX_REG_MAC_CFG1, MAC_CFG1_SR);
 431         udelay(20);
 432
 433         ar71xx_device_stop(pdata->reset_bit);
 434         mdelay(100);
 435         ar71xx_device_start(pdata->reset_bit);
 436         mdelay(100);
 437
 438         /* setup MAC configuration registers */
 439         ag71xx_wr(ag, AG71XX_REG_MAC_CFG1, MAC_CFG1_INIT);
 440
 441         ag71xx_sb(ag, AG71XX_REG_MAC_CFG2,
 442                   MAC_CFG2_PAD_CRC_EN | MAC_CFG2_LEN_CHECK);
 443
 444         /* setup max frame length */
 445         ag71xx_wr(ag, AG71XX_REG_MAC_MFL, AG71XX_TX_MTU_LEN);
 446
 447         /* setup MII interface type */
 448         ag71xx_mii_ctrl_set_if(ag, pdata->mii_if);
 449
 450         /* setup FIFO configuration registers */
 451         ag71xx_wr(ag, AG71XX_REG_FIFO_CFG0, FIFO_CFG0_INIT);
 452         if (pdata->is_ar724x) {
 453                 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG1, pdata->fifo_cfg1);
 454                 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG2, pdata->fifo_cfg2);
 455         } else {
 456                 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG1, 0x0fff0000);
 457                 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG2, 0x00001fff);
 458         }
 459         ag71xx_wr(ag, AG71XX_REG_FIFO_CFG4, FIFO_CFG4_INIT);
 460         ag71xx_wr(ag, AG71XX_REG_FIFO_CFG5, FIFO_CFG5_INIT);
 461
 462         ag71xx_dma_reset(ag);
 463 }
 464
 465 static void ag71xx_hw_start(struct ag71xx *ag)
 466 {
 467         /* start RX engine */
 468         ag71xx_wr(ag, AG71XX_REG_RX_CTRL, RX_CTRL_RXE);
 469
 470         /* enable interrupts */
 471         ag71xx_wr(ag, AG71XX_REG_INT_ENABLE, AG71XX_INT_INIT);
 472 }
 473
 474 static void ag71xx_hw_stop(struct ag71xx *ag)
 475 {
 476         /* disable all interrupts and stop the rx engine */
 477         ag71xx_wr(ag, AG71XX_REG_INT_ENABLE, 0);
 478         ag71xx_wr(ag, AG71XX_REG_RX_CTRL, 0);
 479 }
 480
 481 void ag71xx_link_adjust(struct ag71xx *ag)
 482 {
 483         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
 484         u32 cfg2;
 485         u32 ifctl;
 486         u32 fifo5;
 487         u32 mii_speed;
 488
 489         if (!ag->link) {
 490                 ag71xx_hw_stop(ag);
 491                 netif_carrier_off(ag->dev);
 492                 if (netif_msg_link(ag))
 493                         printk(KERN_INFO "%s: link down\n", ag->dev->name);
 494                 return;
 495         }
 496
 497         cfg2 = ag71xx_rr(ag, AG71XX_REG_MAC_CFG2);
 498         cfg2 &= ~(MAC_CFG2_IF_1000 | MAC_CFG2_IF_10_100 | MAC_CFG2_FDX);
 499         cfg2 |= (ag->duplex) ? MAC_CFG2_FDX : 0;
 500
 501         ifctl = ag71xx_rr(ag, AG71XX_REG_MAC_IFCTL);
 502         ifctl &= ~(MAC_IFCTL_SPEED);
 503
 504         fifo5 = ag71xx_rr(ag, AG71XX_REG_FIFO_CFG5);
 505         fifo5 &= ~FIFO_CFG5_BM;
 506
 507         switch (ag->speed) {
 508         case SPEED_1000:
 509                 mii_speed =  MII_CTRL_SPEED_1000;
 510                 cfg2 |= MAC_CFG2_IF_1000;
 511                 fifo5 |= FIFO_CFG5_BM;
 512                 break;
 513         case SPEED_100:
 514                 mii_speed = MII_CTRL_SPEED_100;
 515                 cfg2 |= MAC_CFG2_IF_10_100;
 516                 ifctl |= MAC_IFCTL_SPEED;
 517                 break;
 518         case SPEED_10:
 519                 mii_speed = MII_CTRL_SPEED_10;
 520                 cfg2 |= MAC_CFG2_IF_10_100;
 521                 break;
 522         default:
 523                 BUG();
 524                 return;
 525         }
 526
 527         if (pdata->is_ar91xx)
 528                 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG3, 0x00780fff);
 529         else if (pdata->is_ar724x)
 530                 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG3, pdata->fifo_cfg3);
 531         else
 532                 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG3, 0x008001ff);
 533
 534         if (pdata->set_pll)
 535                 pdata->set_pll(ag->speed);
 536
 537         ag71xx_mii_ctrl_set_speed(ag, mii_speed);
 538
 539         ag71xx_wr(ag, AG71XX_REG_MAC_CFG2, cfg2);
 540         ag71xx_wr(ag, AG71XX_REG_FIFO_CFG5, fifo5);
 541         ag71xx_wr(ag, AG71XX_REG_MAC_IFCTL, ifctl);
 542         ag71xx_hw_start(ag);
 543
 544         netif_carrier_on(ag->dev);
 545         if (netif_msg_link(ag))
 546                 printk(KERN_INFO "%s: link up (%sMbps/%s duplex)\n",
 547                         ag->dev->name,
 548                         ag71xx_speed_str(ag),
 549                         (DUPLEX_FULL == ag->duplex) ? "Full" : "Half");
 550
 551         DBG("%s: fifo_cfg0=%#x, fifo_cfg1=%#x, fifo_cfg2=%#x\n",
 552                 ag->dev->name,
 553                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG0),
 554                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG1),
 555                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG2));
 556
 557         DBG("%s: fifo_cfg3=%#x, fifo_cfg4=%#x, fifo_cfg5=%#x\n",
 558                 ag->dev->name,
 559                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG3),
 560                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG4),
 561                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG5));
 562
 563         DBG("%s: mac_cfg2=%#x, mac_ifctl=%#x, mii_ctrl=%#x\n",
 564                 ag->dev->name,
 565                 ag71xx_rr(ag, AG71XX_REG_MAC_CFG2),
 566                 ag71xx_rr(ag, AG71XX_REG_MAC_IFCTL),
 567                 ag71xx_mii_ctrl_rr(ag));
 568 }
 569
 570 static int ag71xx_open(struct net_device *dev)
 571 {
 572         struct ag71xx *ag = netdev_priv(dev);
 573         int ret;
 574
 575         ret = ag71xx_rings_init(ag);
 576         if (ret)
 577                 goto err;
 578
 579         napi_enable(&ag->napi);
 580
 581         netif_carrier_off(dev);
 582         ag71xx_phy_start(ag);
 583
 584         ag71xx_wr(ag, AG71XX_REG_TX_DESC, ag->tx_ring.descs_dma);
 585         ag71xx_wr(ag, AG71XX_REG_RX_DESC, ag->rx_ring.descs_dma);
 586
 587         ag71xx_hw_set_macaddr(ag, dev->dev_addr);
 588
 589         netif_start_queue(dev);
 590
 591         return 0;
 592
 593 err:
 594         ag71xx_rings_cleanup(ag);
 595         return ret;
 596 }
 597
 598 static int ag71xx_stop(struct net_device *dev)
 599 {
 600         struct ag71xx *ag = netdev_priv(dev);
 601         unsigned long flags;
 602
 603         netif_carrier_off(dev);
 604         ag71xx_phy_stop(ag);
 605
 606         spin_lock_irqsave(&ag->lock, flags);
 607
 608         netif_stop_queue(dev);
 609
 610         ag71xx_hw_stop(ag);
 611         ag71xx_dma_reset(ag);
 612
 613         napi_disable(&ag->napi);
 614         del_timer_sync(&ag->oom_timer);
 615
 616         spin_unlock_irqrestore(&ag->lock, flags);
 617
 618         ag71xx_rings_cleanup(ag);
 619
 620         return 0;
 621 }
 622
 623 static netdev_tx_t ag71xx_hard_start_xmit(struct sk_buff *skb,
 624                                           struct net_device *dev)
 625 {
 626         struct ag71xx *ag = netdev_priv(dev);
 627         struct ag71xx_ring *ring = &ag->tx_ring;
 628         struct ag71xx_desc *desc;
 629         dma_addr_t dma_addr;
 630         int i;
 631
 632         i = ring->curr % ring->size;
 633         desc = ring->buf[i].desc;
 634
 635         if (!ag71xx_desc_empty(desc))
 636                 goto err_drop;
 637
 638         if (ag71xx_has_ar8216(ag))
 639                 ag71xx_add_ar8216_header(ag, skb);
 640
 641         if (skb->len <= 0) {
 642                 DBG("%s: packet len is too small\n", ag->dev->name);
 643                 goto err_drop;
 644         }
 645
 646         dma_addr = dma_map_single(&dev->dev, skb->data, skb->len,
 647                                   DMA_TO_DEVICE);
 648
 649         ring->buf[i].skb = skb;
 650         ring->buf[i].timestamp = jiffies;
 651
 652         /* setup descriptor fields */
 653         desc->data = (u32) dma_addr;
 654         desc->ctrl = (skb->len & DESC_PKTLEN_M);
 655
 656         /* flush descriptor */
 657         wmb();
 658
 659         ring->curr++;
 660         if (ring->curr == (ring->dirty + ring->size)) {
 661                 DBG("%s: tx queue full\n", ag->dev->name);
 662                 netif_stop_queue(dev);
 663         }
 664
 665         DBG("%s: packet injected into TX queue\n", ag->dev->name);
 666
 667         /* enable TX engine */
 668         ag71xx_wr(ag, AG71XX_REG_TX_CTRL, TX_CTRL_TXE);
 669
 670         return NETDEV_TX_OK;
 671
 672 err_drop:
 673         dev->stats.tx_dropped++;
 674
 675         dev_kfree_skb(skb);
 676         return NETDEV_TX_OK;
 677 }
 678
 679 static int ag71xx_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 680 {
 681         struct ag71xx *ag = netdev_priv(dev);
 682         int ret;
 683
 684         switch (cmd) {
 685         case SIOCETHTOOL:
 686                 if (ag->phy_dev == NULL)
 687                         break;
 688
 689                 spin_lock_irq(&ag->lock);
 690                 ret = phy_ethtool_ioctl(ag->phy_dev, (void *) ifr->ifr_data);
 691                 spin_unlock_irq(&ag->lock);
 692                 return ret;
 693
 694         case SIOCSIFHWADDR:
 695                 if (copy_from_user
 696                         (dev->dev_addr, ifr->ifr_data, sizeof(dev->dev_addr)))
 697                         return -EFAULT;
 698                 return 0;
 699
 700         case SIOCGIFHWADDR:
 701                 if (copy_to_user
 702                         (ifr->ifr_data, dev->dev_addr, sizeof(dev->dev_addr)))
 703                         return -EFAULT;
 704                 return 0;
 705
 706         case SIOCGMIIPHY:
 707         case SIOCGMIIREG:
 708         case SIOCSMIIREG:
 709                 if (ag->phy_dev == NULL)
 710                         break;
 711
 712                 return phy_mii_ioctl(ag->phy_dev, ifr, cmd);
 713
 714         default:
 715                 break;
 716         }
 717
 718         return -EOPNOTSUPP;
 719 }
 720
 721 static void ag71xx_oom_timer_handler(unsigned long data)
 722 {
 723         struct net_device *dev = (struct net_device *) data;
 724         struct ag71xx *ag = netdev_priv(dev);
 725
 726         napi_schedule(&ag->napi);
 727 }
 728
 729 static void ag71xx_tx_timeout(struct net_device *dev)
 730 {
 731         struct ag71xx *ag = netdev_priv(dev);
 732
 733         if (netif_msg_tx_err(ag))
 734                 printk(KERN_DEBUG "%s: tx timeout\n", ag->dev->name);
 735
 736         schedule_work(&ag->restart_work);
 737 }
 738
 739 static void ag71xx_restart_work_func(struct work_struct *work)
 740 {
 741         struct ag71xx *ag = container_of(work, struct ag71xx, restart_work);
 742
 743         ag71xx_stop(ag->dev);
 744         ag71xx_open(ag->dev);
 745 }
 746
 747 static int ag71xx_tx_packets(struct ag71xx *ag)
 748 {
 749         struct ag71xx_ring *ring = &ag->tx_ring;
 750         int sent;
 751
 752         DBG("%s: processing TX ring\n", ag->dev->name);
 753
 754         sent = 0;
 755         while (ring->dirty != ring->curr) {
 756                 unsigned int i = ring->dirty % ring->size;
 757                 struct ag71xx_desc *desc = ring->buf[i].desc;
 758                 struct sk_buff *skb = ring->buf[i].skb;
 759
 760                 if (!ag71xx_desc_empty(desc))
 761                         break;
 762
 763                 ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_PS);
 764
 765                 ag->dev->stats.tx_bytes += skb->len;
 766                 ag->dev->stats.tx_packets++;
 767
 768                 dev_kfree_skb_any(skb);
 769                 ring->buf[i].skb = NULL;
 770
 771                 ring->dirty++;
 772                 sent++;
 773         }
 774
 775         DBG("%s: %d packets sent out\n", ag->dev->name, sent);
 776
 777         if ((ring->curr - ring->dirty) < (ring->size * 3) / 4)
 778                 netif_wake_queue(ag->dev);
 779
 780         return sent;
 781 }
 782
 783 static int ag71xx_rx_packets(struct ag71xx *ag, int limit)
 784 {
 785         struct net_device *dev = ag->dev;
 786         struct ag71xx_ring *ring = &ag->rx_ring;
 787         int done = 0;
 788
 789         DBG("%s: rx packets, limit=%d, curr=%u, dirty=%u\n",
 790                         dev->name, limit, ring->curr, ring->dirty);
 791
 792         while (done < limit) {
 793                 unsigned int i = ring->curr % ring->size;
 794                 struct ag71xx_desc *desc = ring->buf[i].desc;
 795                 struct sk_buff *skb;
 796                 int pktlen;
 797                 int err = 0;
 798
 799                 if (ag71xx_desc_empty(desc))
 800                         break;
 801
 802                 if ((ring->dirty + ring->size) == ring->curr) {
 803                         ag71xx_assert(0);
 804                         break;
 805                 }
 806
 807                 ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_PR);
 808
 809                 skb = ring->buf[i].skb;
 810                 pktlen = ag71xx_desc_pktlen(desc);
 811                 pktlen -= ETH_FCS_LEN;
 812
 813                 dma_unmap_single(&dev->dev, ring->buf[i].dma_addr,
 814                                  AG71XX_RX_PKT_SIZE, DMA_FROM_DEVICE);
 815
 816                 dev->last_rx = jiffies;
 817                 dev->stats.rx_packets++;
 818                 dev->stats.rx_bytes += pktlen;
 819
 820                 skb_put(skb, pktlen);
 821                 if (ag71xx_has_ar8216(ag))
 822                         err = ag71xx_remove_ar8216_header(ag, skb, pktlen);
 823
 824                 if (err) {
 825                         dev->stats.rx_dropped++;
 826                         kfree_skb(skb);
 827                 } else {
 828                         skb->dev = dev;
 829                         skb->ip_summed = CHECKSUM_NONE;
 830                         if (ag->phy_dev) {
 831                                 ag->phy_dev->netif_receive_skb(skb);
 832                         } else {
 833                                 skb->protocol = eth_type_trans(skb, dev);
 834                                 netif_receive_skb(skb);
 835                         }
 836                 }
 837
 838                 ring->buf[i].skb = NULL;
 839                 done++;
 840
 841                 ring->curr++;
 842         }
 843
 844         ag71xx_ring_rx_refill(ag);
 845
 846         DBG("%s: rx finish, curr=%u, dirty=%u, done=%d\n",
 847                 dev->name, ring->curr, ring->dirty, done);
 848
 849         return done;
 850 }
 851
 852 static int ag71xx_poll(struct napi_struct *napi, int limit)
 853 {
 854         struct ag71xx *ag = container_of(napi, struct ag71xx, napi);
 855         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
 856         struct net_device *dev = ag->dev;
 857         struct ag71xx_ring *rx_ring;
 858         unsigned long flags;
 859         u32 status;
 860         int tx_done;
 861         int rx_done;
 862
 863         pdata->ddr_flush();
 864         tx_done = ag71xx_tx_packets(ag);
 865
 866         DBG("%s: processing RX ring\n", dev->name);
 867         rx_done = ag71xx_rx_packets(ag, limit);
 868
 869         ag71xx_debugfs_update_napi_stats(ag, rx_done, tx_done);
 870
 871         rx_ring = &ag->rx_ring;
 872         if (rx_ring->buf[rx_ring->dirty % rx_ring->size].skb == NULL)
 873                 goto oom;
 874
 875         status = ag71xx_rr(ag, AG71XX_REG_RX_STATUS);
 876         if (unlikely(status & RX_STATUS_OF)) {
 877                 ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_OF);
 878                 dev->stats.rx_fifo_errors++;
 879
 880                 /* restart RX */
 881                 ag71xx_wr(ag, AG71XX_REG_RX_CTRL, RX_CTRL_RXE);
 882         }
 883
 884         if (rx_done < limit) {
 885                 if (status & RX_STATUS_PR)
 886                         goto more;
 887
 888                 status = ag71xx_rr(ag, AG71XX_REG_TX_STATUS);
 889                 if (status & TX_STATUS_PS)
 890                         goto more;
 891
 892                 DBG("%s: disable polling mode, rx=%d, tx=%d,limit=%d\n",
 893                         dev->name, rx_done, tx_done, limit);
 894
 895                 napi_complete(napi);
 896
 897                 /* enable interrupts */
 898                 spin_lock_irqsave(&ag->lock, flags);
 899                 ag71xx_int_enable(ag, AG71XX_INT_POLL);
 900                 spin_unlock_irqrestore(&ag->lock, flags);
 901                 return rx_done;
 902         }
 903
 904 more:
 905         DBG("%s: stay in polling mode, rx=%d, tx=%d, limit=%d\n",
 906                         dev->name, rx_done, tx_done, limit);
 907         return rx_done;
 908
 909 oom:
 910         if (netif_msg_rx_err(ag))
 911                 printk(KERN_DEBUG "%s: out of memory\n", dev->name);
 912
 913         mod_timer(&ag->oom_timer, jiffies + AG71XX_OOM_REFILL);
 914         napi_complete(napi);
 915         return 0;
 916 }
 917
 918 static irqreturn_t ag71xx_interrupt(int irq, void *dev_id)
 919 {
 920         struct net_device *dev = dev_id;
 921         struct ag71xx *ag = netdev_priv(dev);
 922         u32 status;
 923
 924         status = ag71xx_rr(ag, AG71XX_REG_INT_STATUS);
 925         ag71xx_dump_intr(ag, "raw", status);
 926
 927         if (unlikely(!status))
 928                 return IRQ_NONE;
 929
 930         if (unlikely(status & AG71XX_INT_ERR)) {
 931                 if (status & AG71XX_INT_TX_BE) {
 932                         ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_BE);
 933                         dev_err(&dev->dev, "TX BUS error\n");
 934                 }
 935                 if (status & AG71XX_INT_RX_BE) {
 936                         ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_BE);
 937                         dev_err(&dev->dev, "RX BUS error\n");
 938                 }
 939         }
 940
 941         if (likely(status & AG71XX_INT_POLL)) {
 942                 ag71xx_int_disable(ag, AG71XX_INT_POLL);
 943                 DBG("%s: enable polling mode\n", dev->name);
 944                 napi_schedule(&ag->napi);
 945         }
 946
 947         ag71xx_debugfs_update_int_stats(ag, status);
 948
 949         return IRQ_HANDLED;
 950 }
 951
 952 static void ag71xx_set_multicast_list(struct net_device *dev)
 953 {
 954         /* TODO */
 955 }
 956
 957 #ifdef CONFIG_NET_POLL_CONTROLLER
 958 /*
 959  * Polling 'interrupt' - used by things like netconsole to send skbs
 960  * without having to re-enable interrupts. It's not called while
 961  * the interrupt routine is executing.
 962  */
 963 static void ag71xx_netpoll(struct net_device *dev)
 964 {
 965         disable_irq(dev->irq);
 966         ag71xx_interrupt(dev->irq, dev);
 967         enable_irq(dev->irq);
 968 }
 969 #endif
 970
 971 static const struct net_device_ops ag71xx_netdev_ops = {
 972         .ndo_open               = ag71xx_open,
 973         .ndo_stop               = ag71xx_stop,
 974         .ndo_start_xmit         = ag71xx_hard_start_xmit,
 975         .ndo_set_multicast_list = ag71xx_set_multicast_list,
 976         .ndo_do_ioctl           = ag71xx_do_ioctl,
 977         .ndo_tx_timeout         = ag71xx_tx_timeout,
 978         .ndo_change_mtu         = eth_change_mtu,
 979         .ndo_set_mac_address    = eth_mac_addr,
 980         .ndo_validate_addr      = eth_validate_addr,
 981 #ifdef CONFIG_NET_POLL_CONTROLLER
 982         .ndo_poll_controller    = ag71xx_netpoll,
 983 #endif
 984 };
 985
 986 static int __devinit ag71xx_probe(struct platform_device *pdev)
 987 {
 988         struct net_device *dev;
 989         struct resource *res;
 990         struct ag71xx *ag;
 991         struct ag71xx_platform_data *pdata;
 992         int err;
 993
 994         pdata = pdev->dev.platform_data;
 995         if (!pdata) {
 996                 dev_err(&pdev->dev, "no platform data specified\n");
 997                 err = -ENXIO;
 998                 goto err_out;
 999         }
1000
1001         if (pdata->mii_bus_dev == NULL) {
1002                 dev_err(&pdev->dev, "no MII bus device specified\n");
1003                 err = -EINVAL;
1004                 goto err_out;
1005         }
1006
1007         dev = alloc_etherdev(sizeof(*ag));
1008         if (!dev) {
1009                 dev_err(&pdev->dev, "alloc_etherdev failed\n");
1010                 err = -ENOMEM;
1011                 goto err_out;
1012         }
1013
1014         SET_NETDEV_DEV(dev, &pdev->dev);
1015
1016         ag = netdev_priv(dev);
1017         ag->pdev = pdev;
1018         ag->dev = dev;
1019         ag->msg_enable = netif_msg_init(ag71xx_msg_level,
1020                                         AG71XX_DEFAULT_MSG_ENABLE);
1021         spin_lock_init(&ag->lock);
1022
1023         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mac_base");
1024         if (!res) {
1025                 dev_err(&pdev->dev, "no mac_base resource found\n");
1026                 err = -ENXIO;
1027                 goto err_out;
1028         }
1029
1030         ag->mac_base = ioremap_nocache(res->start, res->end - res->start + 1);
1031         if (!ag->mac_base) {
1032                 dev_err(&pdev->dev, "unable to ioremap mac_base\n");
1033                 err = -ENOMEM;
1034                 goto err_free_dev;
1035         }
1036
1037         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mii_ctrl");
1038         if (!res) {
1039                 dev_err(&pdev->dev, "no mii_ctrl resource found\n");
1040                 err = -ENXIO;
1041                 goto err_unmap_base;
1042         }
1043
1044         ag->mii_ctrl = ioremap_nocache(res->start, res->end - res->start + 1);
1045         if (!ag->mii_ctrl) {
1046                 dev_err(&pdev->dev, "unable to ioremap mii_ctrl\n");
1047                 err = -ENOMEM;
1048                 goto err_unmap_base;
1049         }
1050
1051         dev->irq = platform_get_irq(pdev, 0);
1052         err = request_irq(dev->irq, ag71xx_interrupt,
1053                           IRQF_DISABLED,
1054                           dev->name, dev);
1055         if (err) {
1056                 dev_err(&pdev->dev, "unable to request IRQ %d\n", dev->irq);
1057                 goto err_unmap_mii_ctrl;
1058         }
1059
1060         dev->base_addr = (unsigned long)ag->mac_base;
1061         dev->netdev_ops = &ag71xx_netdev_ops;
1062         dev->ethtool_ops = &ag71xx_ethtool_ops;
1063
1064         INIT_WORK(&ag->restart_work, ag71xx_restart_work_func);
1065
1066         init_timer(&ag->oom_timer);
1067         ag->oom_timer.data = (unsigned long) dev;
1068         ag->oom_timer.function = ag71xx_oom_timer_handler;
1069
1070         ag->tx_ring.size = AG71XX_TX_RING_SIZE_DEFAULT;
1071         ag->rx_ring.size = AG71XX_RX_RING_SIZE_DEFAULT;
1072
1073         memcpy(dev->dev_addr, pdata->mac_addr, ETH_ALEN);
1074
1075         netif_napi_add(dev, &ag->napi, ag71xx_poll, AG71XX_NAPI_WEIGHT);
1076
1077         err = register_netdev(dev);
1078         if (err) {
1079                 dev_err(&pdev->dev, "unable to register net device\n");
1080                 goto err_free_irq;
1081         }
1082
1083         printk(KERN_INFO "%s: Atheros AG71xx at 0x%08lx, irq %d\n",
1084                dev->name, dev->base_addr, dev->irq);
1085
1086         ag71xx_dump_regs(ag);
1087
1088         ag71xx_hw_init(ag);
1089
1090         ag71xx_dump_regs(ag);
1091
1092         err = ag71xx_phy_connect(ag);
1093         if (err)
1094                 goto err_unregister_netdev;
1095
1096         err = ag71xx_debugfs_init(ag);
1097         if (err)
1098                 goto err_phy_disconnect;
1099
1100         platform_set_drvdata(pdev, dev);
1101
1102         return 0;
1103
1104 err_phy_disconnect:
1105         ag71xx_phy_disconnect(ag);
1106 err_unregister_netdev:
1107         unregister_netdev(dev);
1108 err_free_irq:
1109         free_irq(dev->irq, dev);
1110 err_unmap_mii_ctrl:
1111         iounmap(ag->mii_ctrl);
1112 err_unmap_base:
1113         iounmap(ag->mac_base);
1114 err_free_dev:
1115         kfree(dev);
1116 err_out:
1117         platform_set_drvdata(pdev, NULL);
1118         return err;
1119 }
1120
1121 static int __devexit ag71xx_remove(struct platform_device *pdev)
1122 {
1123         struct net_device *dev = platform_get_drvdata(pdev);
1124
1125         if (dev) {
1126                 struct ag71xx *ag = netdev_priv(dev);
1127
1128                 ag71xx_debugfs_exit(ag);
1129                 ag71xx_phy_disconnect(ag);
1130                 unregister_netdev(dev);
1131                 free_irq(dev->irq, dev);
1132                 iounmap(ag->mii_ctrl);
1133                 iounmap(ag->mac_base);
1134                 kfree(dev);
1135                 platform_set_drvdata(pdev, NULL);
1136         }
1137
1138         return 0;
1139 }
1140
1141 static struct platform_driver ag71xx_driver = {
1142         .probe          = ag71xx_probe,
1143         .remove         = __exit_p(ag71xx_remove),
1144         .driver = {
1145                 .name   = AG71XX_DRV_NAME,
1146         }
1147 };
1148
1149 static int __init ag71xx_module_init(void)
1150 {
1151         int ret;
1152
1153         ret = ag71xx_debugfs_root_init();
1154         if (ret)
1155                 goto err_out;
1156
1157         ret = ag71xx_mdio_driver_init();
1158         if (ret)
1159                 goto err_debugfs_exit;
1160
1161         ret = platform_driver_register(&ag71xx_driver);
1162         if (ret)
1163                 goto err_mdio_exit;
1164
1165         return 0;
1166
1167 err_mdio_exit:
1168         ag71xx_mdio_driver_exit();
1169 err_debugfs_exit:
1170         ag71xx_debugfs_root_exit();
1171 err_out:
1172         return ret;
1173 }
1174
1175 static void __exit ag71xx_module_exit(void)
1176 {
1177         platform_driver_unregister(&ag71xx_driver);
1178         ag71xx_mdio_driver_exit();
1179         ag71xx_debugfs_root_exit();
1180 }
1181
1182 module_init(ag71xx_module_init);
1183 module_exit(ag71xx_module_exit);
1184
1185 MODULE_VERSION(AG71XX_DRV_VERSION);
1186 MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
1187 MODULE_AUTHOR("Imre Kaloz <kaloz@openwrt.org>");
1188 MODULE_LICENSE("GPL v2");
1189 MODULE_ALIAS("platform:" AG71XX_DRV_NAME);